package com.hmdp.utils;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_KEY;
import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshTokenInterceptor implements HandlerInterceptor {
    private StringRedisTemplate redisTemplate;

    public RefreshTokenInterceptor(StringRedisTemplate redisTemplate) {
        this.redisTemplate = redisTemplate;
    }
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        // 1、从请求头获取token
        String token = request.getHeader("authorization");
        if(StrUtil.isBlank(token)){
            return true;
        }
        // 2、从Redis获取用户信息
        Map<Object, Object> userMap = redisTemplate.opsForHash().entries(LOGIN_USER_KEY + token);

        // 3、判断用户是否存在
        if (userMap.isEmpty()) {
            return true;
        }
        // 5、将查询到的hash数据转为UserDTO
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);
        // 6、存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);
        // 7、刷新token有效期
        redisTemplate.expire(LOGIN_USER_KEY + token, LOGIN_USER_TTL, TimeUnit.MINUTES);
        // 8、放行
        return true;
    }
}
